/Engine/Source/Runtime/MeshDescription/Public/MeshDescription.h
Populates the passed array with the edges which form the polygon perimeter
template<typename Alloc> void GetPolygonPerimeterEdges ( const [FPolygonID](API\Runtime\MeshDescription\FPolygonID) PolygonID, [TArray](API\Runtime\Core\Containers\TArray)< [FEdgeID](API\Runtime\MeshDescription\FEdgeID), Alloc > & OutEdgeIDs ) const